Fluid-pressure brake.



W'. V. TURNER.

FLUID PRESSURE BRAKE.

APPLICATION FILED NOV. 6, 1913.

Patented Maiz. 30, 19M.

WLM @Tdi/ffm THE MORRIS PETERS CO., PHOTO-LITHO.. wAsHlNGmN. DA C un in.

WALTER V. TURNER, OE EDGEWOOD, PENNSYLVANIA, ASSIGNOB, '10 THE WESTING-HOUSE AIR BRAKE COMPANY, OFWILMERDING, PENNSYLVANIA, A CORPORATION 0FIPENNSYLVANTA.

Specification of Letters Patent.

rLUni-ranssnnn BRAKE. u

Patented Mar. 300, 1915.

To all 'whom it may concern:

Be it known that I, WALTER V. TURNER, a citizen of the United States,residing at Edgewood, in the county of Allegheny and State ofPennsylvania, have invented new and useful Tmprovements inFluid-Pressure Brakes, of which the following is a specilication.

This invention relates to fluid pressure brakes, and more particularlyto means for securing a higher pressure in an emergency application thanin a service application of the brakes.

Une object of my invention is to provide means operated by the flow offluid to the brake cylinder in emergency for supplying additional fluidto the brake cylinder in order to secure a high pressure therein.

Another object of my invention is to provide means for limiting thedegree of pressure of fluid supplied to the brake cylinder in emergencyto a degree less than that of the source of fluid pressure supply.

Tn the accompanying drawing; Figure 1 is a central sectional view of adistributing valve device with a high pressure valve associatedtherewith and embodying my improvement, the distributing valve beingshown in service application position, and lFig. 2 a similar view,showing the parts in emergency application position.

According to the drawing, my invention is shown applied in connectionlwith a distributing valve device of the well known E T locomotive brakeequipment, comprising a casing 1 having an application portion and anequalizing portion. The application portion comprises a piston 2contained in application cylinder 3, a release valve 4 contained invalve chamber 5 open to brake cylinder passage 6, and application valve7 contained in valve chamber 8 communicating through a pipe 9 with themain reservoir 10, said valves being operated by piston 2. Theequalizing portion comprises a piston 11 contained in piston chamber 12communicating through passage 12 withV brake pipe 141, and main valve 15and graduating valve 16 adapted to be operated by piston 11 andcontained in valve chamber 17. The valve chamber 17 is connected to apressure chamber 18 by passage 19 and the valves 15 and 16 control theadmission and release ofy fluid under pressure to and from theapplication cylinder 3.

According to` my invention, a valve device 1s interposed in the pipe 9between the main reservoir 10 and the distributing valve device andcomprises a casing 20 containing a piston 21 having a chamber 22 on oneside open to pipe 9 on the distributing valve side and a chamber 23 onthe opposite side open to the pipe 9 on the main reservoir sidel throughpassages 24 and'25. The piston 21 operates a valve 26 which controlscommunication from main reservoir passage 24k go a 2pgipe 27 leadingdirectly to brake cylin- The piston 21 is subject to the pressure of anadjustable spring 29 in chamber 22 which tends to maintain the piston 21in the position seating the valve 26 and when the piston is in thisposition, a restricted port 30 establishes communication from the mainreservoir to chamber 22 and the distributing' valve device, said portbeing of such size as to permit only a service rate of flow.

In operation, fluid supplied to the brake pipe shifts the equalizingpiston 11 to release position and the pressure chamber 1S is chargedthrough the usual feed groove 81 around the equalizing piston. Inrelease position of the equalizing valve device, the applicationcylinder 3 is connected to the atmosphere and the application piston 2is in its outer position in which the brake cylinder is open to theexhaust. Tf a service application of the brakes is desired, a gradualreduction in brake pipe pressure is made and the equalizing piston 2 isthereupon shifted to service position, as shown in Fig. 1 of thedrawing.; Fluid is then supplied to the application cylinder 3 from thepressure chamber 18 through port 32 and passage 33. The pressuresupplied to application cylinder 3 shifts the piston 2 to close thebrake cylinder exhaust and open the valve 7 to a degree correspondingwith the rate of reduction in brake pipe pressure. Fluid now flows fromthe main reservoir 10 through passage 24, port 30, chamber 22, and pipeVSi to valve chamber 8, and thence past valve 7 to valve chamber 5 andinto the brake cylinder 28 through passage 6 and pipe 27. The restrictedport 30 is large enough to provide for the service rate of flow, so thatin making a service application of the brakes, no movement of piston 21takes place. If a sudden reduction in brake pipe pressure is made, theequalizing piston is shifted to lili emergency position and the rate offlow to the application cylinder 3 is suliicient to shift theapplication piston to its eXtreme inner position, in Vwhich the`application valve 7 is fully opened, as shown in Fig. 2 of the drawing.In this case, the restricted port 30 is not large enough to provide thenecessary rate of flow from the main reservoir to the brake `cylinderand consequently the higher main reservoir pressure acting in chamber 23on piston 2l operates to shift the piston and open the valve 26. Fluidunder pressure is then supplied from the main reservoir through a largeopening directly to the brake cylinder. lfVhen the brake cylinderpressure has increased to a predetermined degree, dependent upon thetension of the spring 29, the piston 21 is forced downwardly by thespring closing the valve 26Aand preventing further admission of fluidfrom the main reservoir to the brake cylinder. Y For example, if themain reservoir pressure is 110 pounds and the spring is set at 20pounds, when the brake cylinder' pressure has been built up to slightlyexceed 90 pounds the piston will operate to close the supply valve.

It will be understood that my improvement may be employed in connectionwith various other forms of brake apparatus where it is desired tosecure a higher pressure in emer- Vgency than in service.

Y Having now described my invention, what I claim as new and desire tosecure by Letters Patent, is:

1. In a fluid pressure brake, the combination with a source of fluidunder pressure, a brake cylinder, and a valve device for controllingtheV flow of fluid from said source to the brake cylinder, of meansoperated upon a predetermined rate of iiow from said source of pressureto the brake cylinder for also supplying iuid from said source to saidbrake cylinder.

2. In a fluid pressure brake, the combination with a source of fluidunder pressure, a brake cylinder, and a valve device for controlling theflow of fluid from said source to the brake cylinder, of means operatedupon the rate of flow from said source to the brake cylinder exceeding apredetermined degree for opening a direct connection from said source tothe brake cylinder.

v3. In a fluid pressure brake, the combination with a source of iuidunder pressure, a brake cylinder, and a valve devicebperated in servicefor supplying fluid from said source to the brake cylinder and in anemergency application at a greater rate, of means operated by saidgreater rate of flow for opening a direct communication from said sourceto the brake cylinder.

Il. In a fluid pressure brake, the combination with a source of fluidunder pressure, a brake cylinder, and a valve device operated in servicefor supplying fluid from said source to the brake cylinder and in anemergency application at a greater rate, of a valve mechanism subject tothe flow of fluid from said source to said valve device and having meansfor permitting a service rate of flow and operated upon an emergencyrate of flow for opening a direct communication from said source to thebrake cylinder.

5. In a fluid pressure brake, the combination with a main reservoir, abrake cylinder, and a valve device for controlling the supply of fluidfrom the main reservoir to the brake cylinder in service and emergencyapplications of the brakes, of a piston subject on one side to mainreservoir pressure and on the opposite side to the pressure of fluidflowing from the main reservoir to said valve device and a valveoperated by said piston in an emergency application for opening a directconnection from the main reservoir to the brake cylinder.

6. In a fluid pressure brake, the combination with a main reservoir, abrake cylinder, and a valve device for controlling the sup ply fluidfrom the main reservoir to the brake cylinder in service and emergencyapplications of the brakes, of a piston subject on one side to mainreservoir pressure and on the opposite side to a spring and the pressureof fluid supplied to said Avalve device from the main reservoir, and avalve operated by said piston upon an emergency rate of flow to saidvalve device for opening a direct communication from the main reservoirto the brake cylinder.

In testimony whereof I have hereunto set my hand.

WALTER V. TURNER. Witnesses:

A. M. CLEMEN'rs, HOWARD J. BRUSH.

Copies of this patent maybe obtained for ve cents each, by addressingthe Commissioner of Patents,

' Washington, n. e."

